Catalytic performance of core-shell and alloy Pd-Au nanoparticles for total oxidation of VOC: The effect of metal deposition

M. Hosseini, T. Barakat, R. Cousin, A. Aboukaïs, B.-L. Su, G. De Weireld, S. Siffert

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

The catalytic properties of palladium and gold nanoparticles deposited on mesoporous TiO are investigated in toluene and propene oxidation. The catalysts, containing Pd and Au deposited on mesoporous TiO have been prepared by different order of metal deposition (Pd(shell)-Au(core)/TiO , Pd-Au(alloy)/TiO and Au(shell)-Pd(core)/TiO . For both toluene and propene oxidation reactions, the catalytic activity was found significantly higher when palladium is deposited on already-deposited gold (Pd(shell)-Au(core)/TiO ). This enhanced activity could be explained by the core-shell morphology (Pd-shell and Au-core) observed by UV-vis spectra, TPR profiles and XPS spectra. It was suggested that the oxidation reaction follows a Langmuir-Hinshelwood mechanism where the molecules of oxygen and VOC are in competition for adsorption on the surface of catalyst. Operando DRIFT spectroscopy was carried out to test the catalytic activity in a mixture of volatile organic compounds (toluene and propene). It was demonstrated that there is a competition between the molecules of VOC for adsorption but also the toluene has an inhibition effect for oxidation of propene.
langue originaleAnglais
Pages (de - à)218-224
Nombre de pages7
journalApplied Catalysis B: Environmental
Volume111-112
Les DOIs
Etat de la publicationPublié - 12 janv. 2012

Empreinte digitale Examiner les sujets de recherche de « Catalytic performance of core-shell and alloy Pd-Au nanoparticles for total oxidation of VOC: The effect of metal deposition ». Ensemble, ils forment une empreinte digitale unique.

  • Contient cette citation